Sofia_SIRAD_LAZIOSofia_SIRAD_LAZIO

Sofia_SIRADSofia_SIRAD The first variant of apparatus Sofia_SIRAD for on The first variant of apparatus Sofia_SIRAD for on

board of ISS investigations mechanical structure was board of ISS investigations mechanical structure was design;design;

The prototype of small size power supply for space The prototype of small size power supply for space instrument operating on the Russian Segment of ISS instrument operating on the Russian Segment of ISS was produced;was produced;

The trigger system on base of plastic scintillation The trigger system on base of plastic scintillation counters as mechanical design as electronic scheme counters as mechanical design as electronic scheme was developed and produced;was developed and produced;

Preliminary software algorithms was developed;Preliminary software algorithms was developed;

The prototypes of small size power The prototypes of small size power supply and trigger system supply and trigger system

Small size power Small size power supply for operating supply for operating

on the Russian on the Russian Segment of ISSSegment of ISS

3 plastic scintillation counters3 plastic scintillation counters

Electronics of trigger Electronics of trigger systemsystem

PC-104 towerPC-104 tower

AC/DC converter for AC/DC converter for ground workground work

LAZIOLAZIO The mechanical structure design of apparatus LAZIO The mechanical structure design of apparatus LAZIO

detectors for investigations on board of ISS was detectors for investigations on board of ISS was developed;developed;

The small dimension power supply for LAZIO The small dimension power supply for LAZIO detectors was developeddetectors was developed

Three scintillation detectors on base of photomultipliers Three scintillation detectors on base of photomultipliers HP6780 and front-end electronics was developed;HP6780 and front-end electronics was developed;

Two scintillation detectors on base of photodiodes Two scintillation detectors on base of photodiodes (SiPM) and front-end electronics was developed;(SiPM) and front-end electronics was developed;

The trigger system of apparatus LAZIO was developed;The trigger system of apparatus LAZIO was developed; 16 tiles (plastic scintillator+shifter and photodiode) was 16 tiles (plastic scintillator+shifter and photodiode) was

producedproduced

ApparatusApparatus LAZIO LAZIO

Design of LAZIO scintillation detectors SC1&3+SiPMDesign of LAZIO scintillation detectors SC1&3+SiPM

H6780

16030 50 5

Area of mechanical connection

15515

135

30

10

5

Distributor board

10 60

A

View A70

9045

45

190

280

45

SC1&3+SiPMTiles

SiPMSiPMSilicon Photomultiplier (SiPMSilicon Photomultiplier (SiPM))

The SiPM consists of the array (matrix) of p-n-junctions (~103 mm-2) joint together on a common silicon substrate. Each p-n-junction working in limited Geiger mode with a gain 106, but SiPM in whole is analogue detector, because the SiPM output signal is a sum of the signals from p-n-junctions fired by photons

Comparison of characteristics vacuum and SiPM

Characteristics PM SiPM

1.Efficeincy %

470 nm

590 nm

670 nm

20

7-15

< 1

18

17

13

2. Gain factor 106- 107 106

3. Noise-factor 1,3-4.0 1.1-1.3

4. Threshold sensitivity (S/N)

1 1

5. Time jitter, psec

~100 30

6. Bias voltage

Volts

1000-2000 50-100

SiPM + Plastic scintillator = TileSiPM + Plastic scintillator = Tile

Tile:Plastic scintillator

3x3x0.5 cm3

Shifter

SiPM